Selective Gasket Coating for Sealing and Fastener Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gasket coatings fail to simultaneously achieve micro-sealing and slidability, especially when dealing with holes of different features, leading to issues like fastener loosening and degraded sealing due to lubricant deterioration or lack of coating on fastening holes.
Innovation Solution
A gasket with a multilayer coating system where a rubber layer and a lubricating layer are laminated on the metal plate, with the rubber layer providing micro-sealing and the lubricating layer ensuring slidability, and the coating configuration varied based on the specific feature of each hole type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coating layer consisting of a rubber layer and a lubricating layer is applied to the periphery of the fastening hole to ensure slidability, then the gasket can slide smoothly, but the fastening hole position shifts and the fastener loosens due to lubricant deterioration
Solution Approach 1:
The patent applies different coating layer configurations to different regions of the gasket: a lubricating layer is applied only to the sealing surface periphery to provide slidability, while the fastening hole periphery is left without lubricating layer to prevent fastener loosening. This spatial differentiation of coating properties resolves the contradiction between needing slidability and preventing fastener instability.
2Ease of manufacture
If a single-layer coating is applied to the entire surface to simplify manufacturing, then the manufacturing process is simplified, but it is impossible to achieve both micro-sealing and slidability for different hole types
Solution Approach 1:
The patent employs selective coating application where different regions of the gasket surface receive different coating treatments: the sealing surface periphery receives both rubber and lubricating layers for micro-sealing and slidability, while the fastening hole periphery receives only the rubber layer or no coating to prevent fastener loosening. This localized differentiation enables the gasket to simultaneously satisfy the functional requirements of different hole types.
Solution Approach 2:
The coating system is segmented into functionally distinct regions: a sealing region with dual-layer coating (rubber + lubricating) and a fastening region with single-layer or no coating. This segmentation allows each region to be optimized for its specific function while using a relatively simple overall coating process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multilayer coating system effectively secures micro-sealing and slidability even for holes with different features, preventing misalignment and loosening of fasteners while enhancing the overall sealing properties of the gasket.
Implementation Method 1
a lubricating layer having a lower coefficient of friction than the surface of the metal plate portion
Data Source
AI summary
A gasket includes: a metal plate portion having a sealing target hole and a fastening hole; and a coating layer applied to a surface of the metal plate portion. The coating layer includes a rubber layer and a lubricating layer having a lower coefficient of friction than the surface of the metal plate portion. In the coating layer on a part of the surface of the metal plate portion that includes at least a periphery of the sealing target hole, the rubber layer and the lubricating layer are laminated and the lubricating layer is arranged on a surface layer of the coating layer. In the coating layer on a periphery of the fastening hole, the rubber layer is laminated and the rubber layer is arranged on a surface layer of the coating layer.